🔥 Struggling to move legacy IIS-based apps to Azure without a full rewrite?
If your app relies on things like:
– IIS configuration
– Windows Registry
– GAC dependencies
– COM components
👉 Good news: You don’t have to modernize everything upfront.
Azure App Service Managed Instance is a powerful (and often overlooked) option that helps you:
✅ Lift-and-shift legacy .NET / Classic ASP apps
✅ Keep key dependencies intact
✅ Buy time to modernize on your schedule
I’m still surprised by how many architects and senior engineers haven’t come across this yet. Or haven’t given it much thought.
I had the chance to work with Andrew Westgarth (Principal PM) and team last year on a few customer projects, and this capability unlocked some real migration blockers for us.
⚠️ It’s currently in Public Preview (available in ~5 regions)—so now is a great time to evaluate it.
🎥 Want a walkthrough?
Watch this deep dive with Scott + Andrew:
🧪 Try it yourself
Hands-on lab from Ignite 2025:
📘 QuickStart guide:
https://learn.microsoft.com/en-us/azure/app-service/quickstart-managed-instance?tabs=portal
🚀 My recommendation
If you’re evaluating Azure for landing your legacy apps and don’t have the time, skills or resources to modernization right now then
👉 Add this to your shortlist and test it in a POC.
And if it’s not in your region yet—
📣 tag Andrew or drop a comment to help drive demand.
Johnny Harbieh 